San Francisco Sewer Inspection Methodology Presentation October 13, 2016
“Traditional” Methodology 1. Pan & Tilt Camera 2. Panoramo 360 Camera (Est. Starting 2010) 3. Walking Inspection (For Larger Structures)
Pan & Tilt Camera (Sample)
Pan & Tilt Video
Panoramo 360 Camera (Sample)
Panoramo 360 Inspection Video
Pan & Tilt Camera Advantage - More Sturdy Than Panoramo 360 Disadvantage - Inspection Limited to What Camera Points To
Panoramo 360 Camera Advantage - Reviewer Has Control During Video Review Disadvantages - Higher Sensitive To “Bumps” (Can Lead To Missed Images) - Poorer Maneuverability (Esp. Thru Curves and Obstructions) - Not As Good For Observing Certain Types of Infiltration
Latest Equipment Acquisition: Electro Scan (For Detection of “Leaks” in Sewer Due to Openings)
Electro Scan Truck Model ES-620 (Photo taken from the website www.electroscan.com)
Electro Scan Summary Schematic
Electro Scan Demo San Francisco, CA September 15 & 16, 2015
Demo Locations
Site 1 – The Embarcadero & Brannan (East Side of Intersection By Brannan Outfall) Sewers Inspected During Demo
Site 1 (The Embarcadero & Brannan) – Upstream
Site 1 (The Embarcadero & Brannan) – Downstream
Electro Scan Demo Truck On Location
Known Leaking Joint At 12-Inch Sewer
Electro Scan Probe
Cone For Directing Nozzle Spray
Lowering Of Probe (Connected to Jetting Nozzle) Into Upstream MH
Vactor Truck Setup at Downstream MH (For Jetting Nozzle To Pull Probe)
Electro Scan Report (Page 1 For Segment 1)
Electro Scan Report (Page 1 For Segment 2)
Data Uploaded To Cloud Server Assessed Via Critical Sewers
Follow Up With CCTV To View Cause of Electro Scan Defects (If Necessary)
Electro Scan Features Summary • Can scan pipes up to 30” in diameter • Probe emits 10 volts, 40 milliamps (Equivalent to 6 AA batteries) • Assumes 1’ of head above pipe (for volume calculations) • Can scan through grease and roots • Can be used during wet weather • No operator error • Scans upload to cloud within minutes of completion
Electro Scan “Defects” Definition Defects • Small 100-400 µA • Medium 400-700 µA • Large 700+ µA Infiltration is the defect current x the defect length
Electro Scan Used For TDML Locations: 1. Candlestick Point 2. Crissy Field 3. Aquatic Park Sewers sized 15 inches in diameter as less assigned
Other Inspection Methodologies 1. Pole Cam 2. Sonar (By Contractor) 3. Laser (By Contractor)
SFPUC “Repair vs. Replacement” Decision Process
Decision Matrix Developed For Electro Scan Findings SALTWATER INTRUSION SEWER REPAIR DECISION CHART Last Revised September 23, 2016 DEFECT TYPE / DESCRIPTION REPAIR RECOMMENDATION Replacement (per recent internal Brick Sewers proposal) Any Type of defects Manhole Manhole Point Repair Non-Circular Sewers Manual Grouting Significant "Grade 5" Defects (XP, D, BSV, BVV, HSV, HVV, B or H (2 Refer to "Repair Vs. Replacement Any Type of Pipe positions or more), FH4, FH3, CH4, Decision Flowchart" CH3) Refer to "Repair Vs. Replacement Break-In and Intuding Lateral Decision Flowchart" Defect at Lateral Other Lateral Types Point Repair Concrete Pipes > 24" Diameter (Any Number of Defective Joints) Automated Grouting Defective Joint With No Other Less Than 25 % of Joint On Block Automated Grouting Main Sewer Defect Involved Defective Greater Than 25% of Joints On Pipe Lining Block Defective Less Than 25% of Block Having Other Main Sewer Defects Sectional Point Repair Defects (Cracks, Fractures, Small Breaks Greater Than 25% of Block Having and Holes) Pipe Lining Defects Manhole Defects Any Type Causing Infiltration Manhole Point Repair *Note: Prior to assigning repair, research should be performed as to whether sewer assets are on blocks scheduled for projects such as paving, streetscahpe, or others which may result in additional
Contractors Used By SFPUC Wastewater Enterprise National Plant Services Contact: Michelle Beason Phone: 925-262-7366 E-Mail: mbeason@nationplant.com Pipe and Plant Service Contact: Bill Gilmartin Phone: 888-978-8264 E-Mail: bgilmartin@pipeandplant.com Professional Pipe Services (ProPipe) Contact: Jason Walborn Phone: 800-784-7473 E-Mail: jwalborn@hswcorp.com
The End
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